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-rw-r--r--lib/nlattr.c23
1 files changed, 16 insertions, 7 deletions
diff --git a/lib/nlattr.c b/lib/nlattr.c
index e335bcafa9e4..36d74b079151 100644
--- a/lib/nlattr.c
+++ b/lib/nlattr.c
@@ -69,7 +69,8 @@ static int validate_nla_bitfield32(const struct nlattr *nla,
}
static int validate_nla(const struct nlattr *nla, int maxtype,
- const struct nla_policy *policy)
+ const struct nla_policy *policy,
+ const char **error_msg)
{
const struct nla_policy *pt;
int minlen = 0, attrlen = nla_len(nla), type = nla_type(nla);
@@ -87,6 +88,11 @@ static int validate_nla(const struct nlattr *nla, int maxtype,
}
switch (pt->type) {
+ case NLA_REJECT:
+ if (pt->validation_data && error_msg)
+ *error_msg = pt->validation_data;
+ return -EINVAL;
+
case NLA_FLAG:
if (attrlen > 0)
return -ERANGE;
@@ -180,11 +186,10 @@ int nla_validate(const struct nlattr *head, int len, int maxtype,
int rem;
nla_for_each_attr(nla, head, len, rem) {
- int err = validate_nla(nla, maxtype, policy);
+ int err = validate_nla(nla, maxtype, policy, NULL);
if (err < 0) {
- if (extack)
- extack->bad_attr = nla;
+ NL_SET_BAD_ATTR(extack, nla);
return err;
}
}
@@ -250,11 +255,15 @@ int nla_parse(struct nlattr **tb, int maxtype, const struct nlattr *head,
u16 type = nla_type(nla);
if (type > 0 && type <= maxtype) {
+ static const char _msg[] = "Attribute failed policy validation";
+ const char *msg = _msg;
+
if (policy) {
- err = validate_nla(nla, maxtype, policy);
+ err = validate_nla(nla, maxtype, policy, &msg);
if (err < 0) {
- NL_SET_ERR_MSG_ATTR(extack, nla,
- "Attribute failed policy validation");
+ NL_SET_BAD_ATTR(extack, nla);
+ if (extack)
+ extack->_msg = msg;
goto errout;
}
}